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Updated: June 27, 2025
The surveyors had orders to survey the river for the purpose of connecting it with the line of exploration, and the latter was directed to make barometric observations. The commissioner and the remaining engineers were detained at Metis by the necessary astronomic observations.
The condensed steam alone, issuing from a turbine having, for example, a barometric or jet condenser, cannot be directly measured or weighed, unless by meter, and these at present are not sufficiently accurate to warrant their use for test purposes, if anything more than approximate results are desired.
Its intrinsic weight must be exactly equal to the weight of the air it displaces, and since the density of the air decreases according to a fixed law, amounting, approximately, to a difference in barometric reading of 0.1 inch for every 90 feet, it follows, theoretically, that if a balloon is poised at 1,000 feet above sea level, then it would not be in equilibrium at any other height, so long as its weight and volume remain the same.
A hypsometer, or instrument for ascertaining the heights of the Lunar mountains by the barometric pressure under which water boils, a sextant to measure the altitude of the Sun, a theodolite for taking horizontal or vertical angles, telescopes, of indispensable necessity when the travellers should approach the Moon, all these instruments, carefully examined, were found to be still in perfect working order, notwithstanding the violence of the terrible shock at the start.
In either of these positions no land life with which we are acquainted could live on the surface; for the slope of the atmospheric isobars i. e., the lines of equal barometric pressure that produce wind by becoming tilted through unequal expansion, after which the air, as it were, flows down-hill would be too great.
They have been frequently accompanied by barometric troughs, extending south or southwestward toward the Gulf, in which rainy weather and high winds or gales have prevailed. The first frost of the season is reported from a large number of stations, and first snow from about twenty. Verifications.
And how often does the panting and perspiring officer of the deck drag his weary, enervated frame to the skylight in the almost despairing hope that he may detect a depression of the mercury in the barometric tube, giving the promise of a coming change, only to turn away again with a weary, disappointed sigh.
"I knew your energetic nature, and that you would not be happy until you had been on the scene of the crime." "It was very nice and complimentary of you," Holmes answered. "It is entirely a question of barometric pressure." Lestrade looked startled. "I do not quite follow," he said. "How is the glass? Twenty-nine, I see. No wind, and not a cloud in the sky.
According to the barometric theory of Sir William Thomson, he showed that a locust would have to add 60,000,000 pounds to the weight of the atmosphere. Under elasticity and density he stated that elasticity was a mere property of a body, and could not add one grain of force to that exercised by the locust, so as to assist it in performing such wonderful feats.
The horizon retreated as if a carpet were hastily unrolled by magic. The barometric pressure needles turned. "Communications says our rate-of-climb is 4,000 feet a minute and going up fast," Mike announced. "It's five.... We're at 17,000 feet ... 18,000. We should get some eastward velocity at 32,000 feet. Our height is now 21,000 feet...."
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